From: maxime.ripard@free-electrons.com (Maxime Ripard)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to a level all boards can supply
Date: Mon, 3 Aug 2015 11:13:00 +0200 [thread overview]
Message-ID: <20150803091300.GY2564@lukather> (raw)
In-Reply-To: <1438543386-7253-1-git-send-email-public_timo.s@silentcreek.de>
On Sun, Aug 02, 2015 at 09:23:06PM +0200, Timo Sigurdsson wrote:
> sun7i-a20.dtsi contains an cpufreq operating point at 0.9 volts. Most A20 boards
> (or all?), however, do not allow the voltage to go below 1.0V. Thus, raise the
> voltage for the lowest operating point to 1.0V so all boards can actually use
> it.
This is not a property of a board, but is the actual limit documented
by Allwinner for the A20. Some individual SoCs might have wider
tolerances, but that's not a property of a board, it's really a
property of a single SoC, and we cannot make any assumption on the
board.
(and please make sure to run checkpatch before sending your patches)
Thanks!
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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WARNING: multiple messages have this Message-ID (diff)
From: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
To: Timo Sigurdsson <public_timo.s-fWgRPtSzPNU3WX+qO2AYSQ@public.gmane.org>
Cc: robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
pawel.moll-5wv7dgnIgG8@public.gmane.org,
mark.rutland-5wv7dgnIgG8@public.gmane.org,
ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org,
galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org,
linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org,
wens-jdAy2FN1RRM@public.gmane.org
Subject: Re: [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to a level all boards can supply
Date: Mon, 3 Aug 2015 11:13:00 +0200 [thread overview]
Message-ID: <20150803091300.GY2564@lukather> (raw)
In-Reply-To: <1438543386-7253-1-git-send-email-public_timo.s-fWgRPtSzPNU3WX+qO2AYSQ@public.gmane.org>
[-- Attachment #1: Type: text/plain, Size: 781 bytes --]
On Sun, Aug 02, 2015 at 09:23:06PM +0200, Timo Sigurdsson wrote:
> sun7i-a20.dtsi contains an cpufreq operating point at 0.9 volts. Most A20 boards
> (or all?), however, do not allow the voltage to go below 1.0V. Thus, raise the
> voltage for the lowest operating point to 1.0V so all boards can actually use
> it.
This is not a property of a board, but is the actual limit documented
by Allwinner for the A20. Some individual SoCs might have wider
tolerances, but that's not a property of a board, it's really a
property of a single SoC, and we cannot make any assumption on the
board.
(and please make sure to run checkpatch before sending your patches)
Thanks!
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
WARNING: multiple messages have this Message-ID (diff)
From: Maxime Ripard <maxime.ripard@free-electrons.com>
To: Timo Sigurdsson <public_timo.s@silentcreek.de>
Cc: robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com,
ijc+devicetree@hellion.org.uk, galak@codeaurora.org,
linux@arm.linux.org.uk, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com,
wens@csie.org
Subject: Re: [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to a level all boards can supply
Date: Mon, 3 Aug 2015 11:13:00 +0200 [thread overview]
Message-ID: <20150803091300.GY2564@lukather> (raw)
In-Reply-To: <1438543386-7253-1-git-send-email-public_timo.s@silentcreek.de>
[-- Attachment #1: Type: text/plain, Size: 803 bytes --]
On Sun, Aug 02, 2015 at 09:23:06PM +0200, Timo Sigurdsson wrote:
> sun7i-a20.dtsi contains an cpufreq operating point at 0.9 volts. Most A20 boards
> (or all?), however, do not allow the voltage to go below 1.0V. Thus, raise the
> voltage for the lowest operating point to 1.0V so all boards can actually use
> it.
This is not a property of a board, but is the actual limit documented
by Allwinner for the A20. Some individual SoCs might have wider
tolerances, but that's not a property of a board, it's really a
property of a single SoC, and we cannot make any assumption on the
board.
(and please make sure to run checkpatch before sending your patches)
Thanks!
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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next prev parent reply other threads:[~2015-08-03 9:13 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-02 19:23 [PATCH] ARM: dts: sunxi: Raise minimum CPU voltage for sun7i-a20 to a level all boards can supply Timo Sigurdsson
2015-08-02 19:23 ` Timo Sigurdsson
2015-08-02 19:23 ` Timo Sigurdsson
2015-08-02 23:35 ` [linux-sunxi] " Julian Calaby
2015-08-02 23:35 ` Julian Calaby
2015-08-02 23:35 ` Julian Calaby
2015-08-03 2:37 ` Chen-Yu Tsai
2015-08-03 2:37 ` Chen-Yu Tsai
2015-08-03 2:37 ` Chen-Yu Tsai
2015-08-03 4:22 ` [linux-sunxi] " Julian Calaby
2015-08-03 4:22 ` Julian Calaby
2015-08-03 4:22 ` Julian Calaby
2015-08-03 4:26 ` [linux-sunxi] " Chen-Yu Tsai
2015-08-03 4:26 ` Chen-Yu Tsai
2015-08-03 4:26 ` Chen-Yu Tsai
2015-08-03 9:03 ` [linux-sunxi] " Timo Sigurdsson
2015-08-03 9:03 ` Timo Sigurdsson
2015-08-03 9:03 ` Timo Sigurdsson
2015-08-03 9:34 ` [linux-sunxi] " Maxime Ripard
2015-08-03 9:34 ` Maxime Ripard
2015-08-03 9:34 ` Maxime Ripard
2015-08-03 9:36 ` [linux-sunxi] " Julian Calaby
2015-08-03 9:36 ` Julian Calaby
2015-08-03 9:36 ` Julian Calaby
2015-08-04 8:51 ` Timo Sigurdsson
2015-08-04 8:51 ` Timo Sigurdsson
2015-08-04 8:51 ` Timo Sigurdsson
2015-08-03 9:28 ` [linux-sunxi] " Maxime Ripard
2015-08-03 9:28 ` Maxime Ripard
2015-08-03 9:28 ` Maxime Ripard
2015-08-03 8:37 ` [linux-sunxi] " Timo Sigurdsson
2015-08-03 8:37 ` Timo Sigurdsson
2015-08-03 8:37 ` Timo Sigurdsson
2015-08-03 9:23 ` [linux-sunxi] " Maxime Ripard
2015-08-03 9:23 ` Maxime Ripard
2015-08-03 9:23 ` Maxime Ripard
2015-08-03 9:16 ` [linux-sunxi] " Maxime Ripard
2015-08-03 9:16 ` Maxime Ripard
2015-08-03 9:16 ` Maxime Ripard
2015-08-03 9:13 ` Maxime Ripard [this message]
2015-08-03 9:13 ` Maxime Ripard
2015-08-03 9:13 ` Maxime Ripard
2015-08-04 8:38 ` Timo Sigurdsson
2015-08-04 8:38 ` Timo Sigurdsson
2015-08-04 8:38 ` Timo Sigurdsson
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